I've been told that at the *extreme* end that pledging should take no more time than one class, this isn't there. But I've seen things tested for in other chapters in pledging that my chapter wouldn't have even thought about. I know one chapter expects the entire purpose to be memorized (because there is a youtube video of a pledge singing it to Yankee Doodle) and I know of at least two chapters where the pledges are expected to know the pledge class of every active brother and what position they had in it.
I also wouldn't make it that much beyond what the current brothers know. If an active brother would fail the test, its either too hard or the actives need a refresher course. I definitely would test the following: Greek Alphabet, anything on the APO Symbols page(Golden Eagle, etc.), chapters in the section, location of section/region, etc.
I also *thoroughly* support extra credit questions given in advance *with* the understanding that the pledges can share that information among them. These could be things like (at various levels of difficulty)
For 5 points, where is Zeta Pi chapter of APO-Philippines? (Marian College) For 5 more points, on what two days did it charter. 12/3/83 (Fraternity) & 12/7/83 (Sorority)
For 5 points, what section was Wayne State in prior to 55? (54) For 5 more points when did it change (between the Spring 2005 and Spring 2006 conferences, so August of 2005 officially, I believe)
For 5 more points, what section was it in prior to 54? (19) For 5 more points, when did it change (Between Con-con and the 1968 convention).
Note, any pledge who manages to track down the answers to all 6 of these extra credit questions should be initiated on the spot and made historian.